Guida
Yakatakeishi no Nanatsukama is a collection of sea caves located on the coast of Karatsu City, Saga Prefecture, characterized by well-developed basaltic columnar joints. Designated as a National Natural Monument, it is a significant scenic spot within the Genkai Quasi-National Park. The steep cliffs, rising approximately 40 meters high, feature several caves known as 'Nanatsukama' (Seven Caves). Including those hidden beneath the sea surface, the actual number of caves exceeds seven. The central cave is particularly impressive, reaching a depth of 110 meters, showcasing the dynamic and grand scale of natural formation. On clear days, the observation deck offers an expansive view that can reach as far as Iki and Tsushima islands.
The geology of this area was formed by alkaline basalt eruptions approximately 3 million years ago. The columnar joints, created during the cooling process of the lava, form regular vertical pillars that create a sense of natural wonder. The area also holds local legends; the name 'Dokarizaki' is said to originate from a legend involving Empress Jingū's expedition to the Korean Peninsula, where ritual pottery (sake cups) were offered to the sea god to pray for victory and safe return. The nearby Dokarizaki Shrine, which enshrines Princess Kisho, remains a testament to this history.
The greatest highlight is the sight of the sea caves lined along the cliffs. The central cave is especially massive, demonstrating the power of natural erosion. Another notable feature is 'Megane-iwa' (Spectacles Rock) near the western tip, named for its resemblance to a pair of glasses when reflected in the sea surface. The basalt cliffs rising directly from the ocean, combined with the sea spray and deep blue water, create a vibrant and colorful landscape. From a boat, you can enter the caves to observe the intricate natural sculptures from an angle impossible to see from land.
As an outdoor scenic area, there are no fixed operating hours, but visibility depends heavily on weather and sea conditions. On clear days, the view from the observation deck is exceptional. If you plan to take a sightseeing boat, it is essential to check the tide and wave conditions; boat access to the caves is only possible when the sea is calm and during high tide. It is highly recommended to check the local vessel operation status before your visit.
There are two primary ways to enjoy the scenery. First, you can view the cliffs and caves from a high vantage point via the land-based observation decks and walking paths. Second, you can experience the scale of the caves from the water by taking a sightseeing boat from Yobuko Port. Using boats like the 'Ikamaru' allows you to witness the interior of the sea caves up close. The area is also known as a diving spot, offering a rich underwater environment for advanced divers.
The area around Nanatsukama is developed as the Nanatsukama Garden, which includes parking lots and restrooms. Nearby, you can find other unique geological formations such as 'Megane-iwa' and the 'Minato no Tatekami-iwa' rock pillar. It is approximately a 30-minute drive from Karatsu city center. The area is part of the Genkai Quasi-National Park, maintaining a preserved and rich natural environment.